That highlights my point pretty well - you've chosen one of the c# impls that doesn't use anything more than a few compiler hints but it's slower than the java solution.

However if you look at the overall results, c# is about 25% faster on mandlebrot, and when you peek under the covers - https://benchmarksgame-team.pages.debian.net/benchmarksgame/... - you find it's using AVX vector instructions.

Not like for like in the summary view which is why i think those results are misleading.